How can i export the data to excel which has 2 tables with same number of columns & column names?

Question

Hi everyone, again landed up with a problem.
After trying a lot to do it myself, finally decided to post here..
I have created a form in form builder 6i, in which on clicking a button the data gets exported to excel sheet.
It is working fine with a single table. The problem now is that i am unable to do the same with 2 tables.
Because both the tables have same number of columns & column names.
Below are 2 tables with column names:
Table-1 (MONTHLY_PART_1)
Table-2 (MONTHLY_PART_2)
SL_NO
SL_NO
COMP
COMP
DUE_DATE
DUE_DATE
U-1
U-1
U-2
U-2
U-4
U-4
U-20
U-20
U-25
U-25
Since both the tables have same column names, I'm getting the following error :
Error 402 at line 103, column 4
  alias required in SELECT list of cursor to avoid duplicate column names.
So How can i export the data to excel which has 2 tables with same number of columns & column names?
Should i paste the code? Should i post this query in 'SQL and PL/SQL' Forum?
Help me with this please.
Thank You.

Answer 1

You'll have to *alias* your columns, not prefix it with the table names:
$[CHE_TEST@asterix1_impl] r
  1  declare
  2    cursor cData is
  3      with data as (
  4        select 1 id, 'test1' val1, 'a' val2 from dual
  5        union all
  6        select 1 id, '1test' val1, 'b' val2 from dual
  7        union all
  8        select 2 id, 'test2' val1, 'a' val2 from dual
  9        union all
10        select 2 id, '2test' val1, 'b' val2 from dual
11      )
12      select a.id, b.id, a.val1, b.val1, a.val2, b.val2
13      from data a, data b
14      where a.id = b.id
15      and a.val2 = 'a'
16      and b.val2 = 'b';
17  begin
18    for rData in cData loop
19      null;
20    end loop;
21* end;
  for rData in cData loop
ERROR at line 18:
ORA-06550: line 18, column 3:
PLS-00402: alias required in SELECT list of cursor to avoid duplicate column names
ORA-06550: line 18, column 3:
PL/SQL: Statement ignored
$[CHE_TEST@asterix1_impl] r
  1  declare
  2    cursor cData is
  3      with data as (
  4        select 1 id, 'test1' val1, 'a' val2 from dual
  5        union all
  6        select 1 id, '1test' val1, 'b' val2 from dual
  7        union all
  8        select 2 id, 'test2' val1, 'a' val2 from dual
  9        union all
10        select 2 id, '2test' val1, 'b' val2 from dual
11      )
12      select a.id a_id, b.id b_id, a.val1 a_val1, b.val1 b_val1, a.val2 a_val2, b.val2 b_val2
13      from data a, data b
14      where a.id = b.id
15      and a.val2 = 'a'
16      and b.val2 = 'b';
17  begin
18    for rData in cData loop
19      null;
20    end loop;
21* end;
PL/SQL procedure successfully completed.
cheers